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本帖最后由 chinatown 于 2017-1-6 13:48 编辑
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' Y: P) d2 N- n2 ], L5 eIEC 60216-4-1 is a standard providing requirements for ovens for aging tests and requires forced gas$ O2 ~3 S5 W% L
ventilation. As the ball pressure test is not considered to be an ageing test such forced gas ventilation) j1 Z3 c( P8 @0 B: `, H0 _
is not required and should not be confused with forced convection.7 Y& J8 ]/ z' ^( c
For the purpose of ball pressure testing chambers with or without forced convection may be used,
4 f: b$ _, o3 D2 d0 e7 i& `provided all other requirements are fulfilled. n- ?& [, F. J+ {. C$ G, E" S
Following clause 5.2 of the standard and considering the note there, a separate thermocouple on or
! E8 L3 q6 q- ~, m" dright below the surface of the test specimen support and as close as practical to the test sample shall
z2 u; g/ W2 h3 P2 N' p8 {1 lbe used to check that the temperature of the test specimen support does not significantly deviate from9 a/ ^) j6 I) m+ F- H7 ?
the test temperature.9 _: n7 x1 n& c& b: T
In addition measure the air temperature as close as possible to the test specimen.; ^0 O* Q! e J0 _. D
In case of non-round indentation obtained, report the biggest diameter measurement observed. The# t+ b R8 f! A0 v+ R4 X* Q& O$ _
maximum difference between the longest and shortest measurement should not exceed 0,2 mm.
0 ^" J' Z" A" D3 \$ M# p: A$ gWhere the product standard contains differing or conflicting requirements to IEC 60695-10-2 or to this
& U7 \* r& ^: R7 Q, E, Qdecision sheet these product standard requirements override the requirements from IEC 60695-10-2
3 f! u, w* a) K) T3 Aand this decision sheet.& Q5 Z% z% M3 x& C
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发表于 2017-1-6 13:46
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